exchange on premise migration to 0365 iOS Mail app

After migrating a test user exchange account from 2010 sp3 on premise to O365, the account cannot be added to the native IOS mail app any longer. Using the microsoft mail app does work. Several users prefer the ios mail app and i am indifferent to either. Has anyone experienced issues with mail connections for the ios mail app?

Justin,
Thanks for the tip. It did not help i was doing this testing and migration at 2 am so my brain was fried. I tried all combinations but that as i was used to having to include DOMAIN. Got it working now.
Thanks a bunch.

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